Modular design and analysis of the x-by-wire center point steering independent suspension for in-wheel electric vehicle

Abstract

In this article, a new design scheme of x-by-wire steering suspension system is proposed, which aims to solve the adaptation problem of the traditional steering system, suspension system, and the electric wheel. It meets the requirement of fourwheel independent steering function with large scale. The design keeps wheel steering center axis to coincide with the virtual wheel kingpin, thereby realizing the application of the center point steering independent suspension system in electric wheels. In addition, modular design is adopted to reduce the coupling between the system and the car body, thereby realizing the generalization of the front and rear steering suspension system, and it also decreases the number of components. Furthermore, the theoretical analysis and parameter design of the self-aligning torque of the suspension are carried out. The multi-body dynamics model of system is established, and the performance is simulated in both time domain and frequency domain. The comparison test shows that the center point steering independent suspension has higher feasibility. Finally, a prototype of the system is developed, which provides a new idea for the designing of chassis for electric vehicles.

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“…Huang et al [12] proposed a path tracking integrated chassis control algorithm using four-wheel steering and direct yaw moment control for four-wheel chassis, which improved the chassis's path-tracking performance and handling stability. Chi et al [13] designed a new steer-by-wire suspension system that can meet the largescale four-wheel independent steering function and verified its feasibility through system multi-body dynamics simulation and time-frequency performance analysis. Zhu et al [14] designed a forestry chassis with an articulated body with three degrees of freedom and installed luffing wheel legs and carried out a dynamic simulation study on its motion performance based on the proposed obstacle-crossing strategy.…”

Stability analysis of the food delivery robot with suspension damping structure

“…The active adaptive suspension adapts to complex terrains by adjusting its own attitude, which is suitable for large and medium-sized unmanned vehicles; In comparison, the passive suspension structure is more suitable for smaller food delivery robots. Typical passive adaptive suspension structures include rocker-bogie suspension [16] , [17] , [18] , parallelogram suspension [19] , independent suspension [20] , [21] , and articulated rocker suspension [22] , [23] , [24] . In order to adapt to complex outdoor working environment, the existing suspension mechanism is comprehensively analyzed.…”